Subantarctic Foraminiferal Mg/Ca Data and SST Reconstruction: Readme file
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              World Data Center for Paleoclimatology, Boulder
                                and 
                   NOAA Paleoclimatology Program
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!

NAME OF DATA SET: Subantarctic Foraminiferal Mg/Ca Data and SST Reconstruction

LAST UPDATE: 3/2001 (Original Receipt by WDCA Paleo)  
CONTRIBUTOR: David Lea, University of California-Santa Barbara

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2001-022

SUGGESTED DATA CITATION: Mashiotta, T. A., et al., 2001, 
Subantarctic Foraminiferal Mg/Ca Data and SST Reconstruction, 
IGBP PAGES/World Data Center A for Paleoclimatology 
Data Contribution Series #2001-022.
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA. 

ORIGINAL REFERENCE: Mashiotta, T. A., D.W. Lea, and H.J. Spero, 1999. 
Glacial-interglacial changes in Subantarctic sea surface temperature 
and d18O-water using foraminiferal Mg. 
Earth Planet. Sci. Lett. 170, 417-432.

FUNDING SOURCES:  National Science Foundation (USA),
National Oceanic and Atmospheric Administration (USA).

GEOGRAPHIC REGION: Southern Ocean
PERIOD OF RECORD: 290 KYrBp-present

LIST OF FILES: Readme_Mashiotta1999.txt (this file),
E11-2.txt, RC11-120.txt (tab-delimited ASCII format).


DESCRIPTION: 
Globigerina bulloides Mg/Ca as a paleotemperature proxy. 
Indicated glacial-interglacial changes in sea surface temperature
(SST) are about 4°C cooler in the Subantarctic Indian Ocean and 
2.5°C cooler in the Subantarctic Pacific. 

Mg/Ca-based SST estimates and d18O determinations are then used to 
generate site-specific seawater d18O records.


File RC11-120.txt
Core RC11-120
43°31'S
79°52'E
3135m water depth

Variables and units: Depth (cm), Age (ky), G. bulloides O18 (PDB), 
Mg/Ca (mmol/mol), SST (°C), O18w (SMOW)

Data precision: Mg/Ca, ±2.1%; SST (est.), ±0.8°C; O18w (est.), ±0.2"

G. bulloides O18 interpolated from Hays et al., 1976 and 
Imbrie et al., 1992, 
Mg/Ca data on cleaned G. bulloides shells by ICP-MS, 
SST estimates based on eq. (5) in Mashiotta et al., 1999, 
O18w calculated from bulloides O18 data, Mg/Ca-temperature estimates and 
Shackleton, 1974 paleo-temperature equation.

chrono-strat info: SPECMAP age model from Imbrie et al, 1992



File E11-2.txt
Core E11-2
56°04'S
115°05'W
3094m water depth


Variables and units: Depth (cm), Age (ky), N. pachyderma (s) O18 (PDB), 
Mg/Ca (mmol/mol), SST (°C), O18w (SMOW)

Data precision: Mg/Ca, ±2.1%; SST (est.), ±1°C; O18w (est.), ±0.2"


N. pachyderma (s) O18 interpolated from Ninnemann and Charles, 1997, 
Mg/Ca data on cleaned N. pachyderma (s) shells by ICP-MS, 
SST estimates based on eq. (6) in Mashiotta et al., 1999, 
O18w calculated from pachyderma O18 data, Mg/Ca-temperature estimates and 
Shackleton, 1974 paleo-temperature equation.

chrono-strat info: calendar age model from Ninnemann and Charles, 1997